Abstract:The three layer structure of the improved design scheme of centralized intelligent control system are used instead of two layer structure, i.e., the intelligent sensor, intelligent measuring instrument and computer. The computer can directly read sensor data, can also be accessed intelligent measuring instrument data, through a certain means of communication with PLC computer connection, read data, analysis, and performs like a computer instruction equipment. This scheme solves the problems of two layer structure, and is also suitable for other types of control system of large scale. This design scheme has appear data acquisition lost phenomenon. This paper presents linear characteristic data acquisition algorithm based on historical data and control curve database, solves the problem of missing data. And the temperature control system as an example of simulation in the test results under the environment of the large scale control, has developed the corresponding product and applied in the actual industrial production and teaching experiment.
